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    # Arduino 伺服馬達 ###### tags: `Arduino` ## 目錄 [TOC] ## library ```cpp= #include <Servo.h> ``` ## 圖片 ![](https://i.imgur.com/20McrNn.jpg) ## 電路 - 電源線:通常為紅色,應連接到 Arduino 板上的 5V 腳位 - 接地線:常為黑色或棕色,應連接到 Arduino 板上的接地腳位(GND) - 信號線:通常為黃色、橙色或白色,應連接到 Arduino 板上的數字腳位 順便一提的,單顆伺服馬達在運作時,所需電流大約是 300mA。如果你需要 2 顆以上的伺服馬達同時運作,就要外接高電流的變壓器來供電,不然就會經常出現抖動的情況。 ## Servo - attach() Attach the Servo variable to a pin. ```cpp= servo.attach(pin); servo.attach(pin, min, max); ``` - min:最小 0 度 - max:最大 180 度 - pin:腳位 ## Servo - write() Writes a value to the servo, controlling the shaft(軸) accordingly. On a continuous rotation servo, this will set the speed of the servo (with 0 being full-speed in one direction, 180 being full speed in the other, and a value near 90 being no movement. - 多搭配迴圈讓伺服馬達進行轉動 - 和 delay() 控制轉速 ```cpp= servo.write(angle); ``` - $0 <$ angle $< 180$ example: ```cpp= #include <Servo.h> Servo myservo; // 宣告馬達 void setup() { myservo.attach(9); myservo.write(90); } void loop() {} ``` ## Servo - writeMicroseconds() Writes a value in microseconds (us) to the servo, controlling the shaft accordingly. On standard servos a parameter(參數) value of 1000 is fully counter-clockwise, 2000 is fully clockwise, and 1500 is in the middle. - 較常使用 write() ```cpp= servo.writeMicroseconds(us) ``` - $1000 <$ us $< 2000$ ## Servo - read() 回傳馬達當前的角度 ```cpp= servo.read() ``` - $0 <$ 回傳角度 $< 180$ ## Servo - attached() 回傳馬達是否 attach 到腳位(布林值),如果有就回傳 true,否則回傳 false ```cpp= servo.attached() ``` ## Servo - detach() 將馬達從腳位分離 ```cpp= servo.detach() ``` ## 參考資料 - [[Arduino範例] SG90 Servo伺服馬達](https://blog.jmaker.com.tw/arduino-servo-sg90/) - [Arduino Servo](https://www.arduino.cc/reference/en/libraries/servo/)

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